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    • Spray and Evaporation Characteristics of Heavy Duty Diesel Engines at Low Temperatures
    DOI：10.13949/j.cnki.nrjgc.2020.05.001
    Key Words:heavy duty diesel engine  low temperature  nozzle diameter  ambient temperature  spray
    Author NameAffiliation
    SHI Zhicheng, WU Han, LI Haiying, LIU Fushui 1.School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China
     2.China North Engine Research Institute, Tianjin 300400, China 
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    Abstract:The effects of nozzle diameter (0.12~0.32mm) and ambient temperature (550~850K) on the spray characteristics of heavy duty diesel engines were measured visually in a constant volume combustion chamber using the Mie scattering and shadowgraph methods. The results showed that, different from the light duty diesel engines, the liquid phase fuel of the heavy duty diesel engines with the 0.32mm nozzle still penetrated continuously and failed to reach a quasi steady state when the ambient temperature was increased to 750K at various injection pressures and ambient pressures, or when reaching a quasi steady state, the penetration distance was too long, leading to spray impingement. With the increase of the ambient temperature, the adhesion amount of liquid spray with the 0.32mm nozzle decreased. Only when the evaporation of fuel was strong enough at the ambient temperature of 850K, could the height and radius of impingement spray reach a quasi steady state.
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